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/trunk/src/sqlite/test/tkt-b72787b1.test

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Possible License(s): BSD-3-Clause
 1# 2011 February 21
 2#
 3# The author disclaims copyright to this source code.  In place of
 4# a legal notice, here is a blessing:
 5#
 6#    May you do good and not evil.
 7#    May you find forgiveness for yourself and forgive others.
 8#    May you share freely, never taking more than you give.
 9#
10#***********************************************************************
11# This file implements regression tests for SQLite library.
12#
13# This file implements tests to verify that ticket [b72787b1a7] has been
14# fixed.  From the ticket:
15#
16#     The sqlite3ExpirePreparedStatements routine marks all statements
17#     as expired. This includes statements that are not expired.
18#
19#     Steps to reproduce:
20#
21#        * Prepare a statement (A)
22#        * Alter the schema to invalidate cookie in A
23#        * Prepare a statement (B)
24#        * Run B and have A run as part of B
25#        * A will find a bad cookie and cause *all* statements
26#          to be expired including the currently running B by calling
27#          sqlite3ExpirePreparedStatements
28#        * When control returns to B it will then abort 
29#
30#     The bug is that sqlite3ExpirePreparedStatements expires all statements.
31#     Note that B was prepared after the schema change and hence is perfectly
32#     valid and then is marked as expired while running.
33#
34
35set testdir [file dirname $argv0]
36source $testdir/tester.tcl
37
38unset -nocomplain ::STMT
39proc runsql {} {
40  db eval {CREATE TABLE IF NOT EXISTS t4(q)}
41  sqlite3_step $::STMT
42  set rc [sqlite3_column_int $::STMT 0]
43  sqlite3_reset $::STMT
44  return $rc
45}
46
47do_test tkt-b72787b1.1 {
48  db eval {
49    CREATE TABLE t1(x);
50    INSERT INTO t1 VALUES(1);
51    INSERT INTO t1 VALUES(2);
52    CREATE TABLE t2(y);
53    INSERT INTO t2 SELECT x+2 FROM t1;
54    INSERT INTO t2 SELECT x+4 FROM t1;
55  }
56  db func runsql ::runsql
57  set DB [sqlite3_connection_pointer db]
58  set sql {SELECT max(x) FROM t1}
59  set ::STMT [sqlite3_prepare_v2 $DB $sql -1 TAIL]
60
61  # The runsql() call on the second row of the first query will
62  # cause all $::STMT to hit an expired cookie.  Prior to the fix
63  # for [b72787b1a7, the bad cookie would expire all statements, including
64  # the following compound SELECT, which would cause a fault when the
65  # second SELECT was reached.  After the fix, the current statement
66  # continues to completion.
67  db eval {
68    SELECT CASE WHEN y=3 THEN y+100 WHEN y==4 THEN runsql()+200
69                ELSE 300+y END FROM t2
70    UNION ALL
71    SELECT * FROM t1;
72  }
73} {103 202 305 306 1 2}
74
75sqlite3_finalize $::STMT
76
77finish_test